Trump slams 'Crooked, Dirty Cops' in furious tweets before Attorney General William Barr's press conference on the Mueller report

President Donald Trump speaks during a news conference following Tuesday's midterm congressional elections at the White House in Washington, November 7, 2018.

President Donald Trump lashed out at "Crooked, Dirty Cops" and the Democratic National Committee in a series of heated tweets Thursday ahead of the release of a redacted version of Robert Mueller's long-awaited Russia report.

Trump, who did not mention the probe of Russian election interference directly but has regularly denounced it as a hoax and a "witch hunt," tweeted Thursday morning about "The Greatest Political Hoax of all time!"

Attorney General William Barr was scheduled to hold a press conference at the Justice Department at 9:30 a.m. ET — before releasing to the public a redacted version of the special counsel's nearly 400-page report on Russia's interference and possible coordination with Trump's campaign and whether the president committed obstruction of justice.

Democrats including House Judiciary Chairman Jerrold Nadler of New York have criticized the timing, accusing Trump's recently appointed attorney general of attempting to establish a narrative about the findings in the report.

In a four-page letter last month, Barr said Mueller did not find sufficient evidence of a conspiracy between Trump's campaign and the Kremlin. Barr and Deputy Attorney General Rod Rosenstein also concluded that Trump did not illegally obstruct justice.

At the press conference, Barr will address whether the White House invoked executive privilege related to parts of the report, as well as the department's interactions with the White House regarding the contents of the report, according to a DOJ spokeswoman.

Barr will also talk about the process officials followed when redacting certain portions of the report for a public release. Questions about what will be redacted have become especially controversial on Capitol Hill, as some Democratic leaders continue to demand that Barr provide for them the full report along with all of its underlying evidence.

Barr has signaled his resistance to hand the lawmakers a completely unscrubbed report, but the DOJ does plan to share a less-redacted version with some members of Congress and their staff some time after the public version has been released, according to a court filing in the Roger Stone case.

In a follow-up, Trump sent a two-word tweet exclaiming "PRESIDENTIAL HARASSMENT!" That phrase has become a familiar refrain for the president in the final months of the special counsel's 22-month investigation.